Hi all,

I had few doubts after reading this article:

http://www.onsip.com/blog/2013/07/02/in-depth-verizon-blocks-sip-traffic-using-alg

According to this article, SIP ALG present in Verizon's network
modifies certain headers before transmitting to the server.
Parameters like, contact header, via header, tag value in from header
are modified before being transmitted to the end-point. Also, the
order in which headers are placed are also modified.

Should this cause any problem for the entity on the other end to
respond? Can someone provide some light o this matter?

I personally feel, it should not cause any problems as ip-address
present in via, contact were modified because of NATting performed.

Thanks and Regards,
Peeyush

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